Polar Asset Management discloses 5.6% Blaize Holdings (BZAI) stake in ownership filing

Rhea-AI Filing Summary

Polar Asset Management Partners Inc., an Ontario-based investment adviser, reported beneficial ownership of common stock of Blaize Holdings, Inc..

Polar, as investment adviser to Polar Multi-Strategy Master Fund, reported beneficial ownership of 9,375,000 shares of Blaize common stock, representing 5.6% of the class as of June 30, 2026. Polar reported sole voting power and sole dispositive power over all 9,375,000 shares, with no shared voting or dispositive power.

Key Figures

Shares beneficially owned: 9,375,000 shares Percent of class: 5.6% Sole voting power: 9,375,000 shares +2 more

5 metrics

Shares beneficially owned 9,375,000 shares Common stock of Blaize Holdings, Inc. beneficially owned by Polar Asset Management Partners Inc.

Percent of class 5.6% Percentage of Blaize Holdings common stock class beneficially owned as of June 30, 2026

Sole voting power 9,375,000 shares Shares over which Polar Asset Management Partners has sole power to vote or direct the vote

Sole dispositive power 9,375,000 shares Shares over which Polar Asset Management Partners has sole power to dispose or direct disposition

Signature date 08/14/2026 Date Andrew Ma, Chief Compliance Officer, signed the ownership statement

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power, exempt market dealer

4 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 9375000"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"5 | Sole Voting Power 9,375,000.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 9,375,000.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

exempt market dealer regulatory

"investment fund manager, portfolio manager, exempt market dealer and commodity trading manager"

An exempt market dealer is a licensed financial intermediary who helps buy, sell and advise on private securities that are not offered through the public, regulated market. Think of them as a specialist broker for private deals—important to investors because they provide access to investments that can offer higher returns or diversification but come with less public information, fewer safeguards and higher risk than publicly traded stocks.

FAQ

What percentage of Blaize Holdings, Inc. (BZAI) does Polar Asset Management Partners own?

Polar Asset Management Partners reported beneficial ownership of 5.6% of Blaize Holdings’ common stock. This corresponds to 9,375,000 shares over which Polar has sole voting and dispositive power through its advised fund.

How many Blaize Holdings, Inc. (BZAI) shares does Polar Asset Management Partners control?

Polar Asset Management Partners reported beneficial ownership of 9,375,000 Blaize Holdings common shares. It has sole voting and sole dispositive power over all these shares and no shared voting or dispositive authority.

What is the nature of Polar Asset Management Partners’ interest in Blaize Holdings, Inc. (BZAI)?

Polar Asset Management Partners acts as investment advisor to Polar Multi-Strategy Master Fund, which directly holds Blaize shares. Polar reports beneficial ownership with sole voting and dispositive power over 9,375,000 shares, representing 5.6% of the class.

Is Polar Asset Management Partners’ ownership in Blaize Holdings, Inc. (BZAI) reported as sole or shared power?

Polar reported sole power to vote and dispose of 9,375,000 Blaize shares and no shared power. Sole voting and dispositive power indicate Polar alone controls how these shares are voted and whether they are sold.

Who signed the beneficial ownership report for Blaize Holdings, Inc. (BZAI)?

The beneficial ownership report was signed by Andrew Ma, Chief Compliance Officer of Polar Asset Management Partners Inc., on August 14, 2026, certifying the information regarding the 9,375,000 shares and 5.6% ownership stake.

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Available on EDGAR 08/14/2026 - 10:00 PM Accepted by SEC EDGAR 08/14/2026 - 09:59 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Blaize Holdings, Inc.

(Name of Issuer)

Common stock, par value $0.0001 per sharee

(Title of Class of Securities)

092915107

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 092915107

1

Names of Reporting Persons

Polar Asset Management Partners Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 9,375,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 9,375,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,375,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.6 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Blaize Holdings, Inc.
(b)	Address of issuer's principal executive offices: 4659 Golden Foothill Parkway, Suite 206 El Dorado Hills, California
Item 2.
(a)	Name of person filing: This statement is filed by Polar Asset Management Partners Inc., a company incorporated under the laws of Ontario, Canada, which serves as the investment advisor to Polar Multi-Strategy Master Fund, a Cayman Islands exempted company ("PMSMF") with respect to the shares directly held by PMSMF.
(b)	Address or principal business office or, if none, residence: 16 York Street, Suite 2900, Toronto, Ontario, M5J 0E6
(c)	Citizenship: Canada
(d)	Title of class of securities: Common stock, par value $0.0001 per sharee
(e)	CUSIP Number(s): 092915107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
	The Reporting Person is an investment fund manager, portfolio manager, exempt market dealer and commodity trading manager registered with the Ontario Securities Commission.
Item 4.	Ownership
(a)	Amount beneficially owned: 9375000
(b)	Percent of class: 5.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 9375000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 9375000
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Polar Asset Management Partners Inc.

Signature:	Andrew Ma
Name/Title:	Chief Compliance Officer
Date:	08/14/2026